A database about Preparation of Laboratory Reagents. A Project of SCIENCE Pakistan

REDOX Indicators

Amido black 10 B
dissolve 0.2 g in 100 ml of water
color change = yellowish-brown to blue
 
2.2'Bipyridin (iron(II) complex
dissolve 0.695 g of FeSO4.7H2O and 1.171 g of 2.2'-bipyridin in 100 ml of water
color change = pale blue to red
 
Brillant cresyl blue
dissolve 0.5 g in 100 ml of water or ethanol (96 %)
color change = blue to colorless
 
2.6-Dichlorophenolin-dophenol sodiumsalt (dihydrate)
dissolve 0.02 g in 100 ml of water
color change = blue to colorless
 
3.3'-Dimethylnahthidine(4.4'-Diamino-3.3-dimethyl-1.1'-binaphthaline)
dissolve 1.0 g in 100 ml of glacial acetic acid
color change = purple-red to colorless
 
N,N-Dimethyl-1.4-phenylenediammonium dichloride
dissolve 0.02 g in 100 ml of water
color change = dark-blue to colorless
 
Diphenylamine:
Dissolve 1g in 100 ml conc. H2SO4
color change = blue-violet to colorless
 
Diphenylamine-4-sulfonic acid barium salt
Dissolve 0.2g in 100 ml water
color change = red-violet to colorless
 
Diphenylamine-p-sulphonic acid (Na salt):
Dissolve 0.2g in 100 ml water.
 
Diphenylbenzidine:
Dissolve 1g in 100 ml conc.H2SO4
color change = violet to colorless
 
Ferroin:
Make a 0.025M in water.
color change = blue to orange-red
 
Indigo carmine (Indigo disulfonate disodium salt)
Dissolve 0.5g in 100 ml water
color change = blue to yellowish
 
N-Methlydiphenylamine-p-solphonic acid, (Na salt):
Dissolve 0.1g in 100 ml water.
 
Methylene blue
Dissolve 0.1 to 0.5g in 100 ml water
color change = blue to colorless
 
Neutral red
Dissolve 0.5g in 100 ml of 95% ethanol
color change = violet-red to colorless
 
Nile blue (sulphate)
Dissolve 0.1g in 100 ml water
color change = blue-red to colorless
 
1.10-Phenanthroline (monohydrate)
Dissolve 0.695 g of FeSO4 x 7H2O and 1.487 g of 1.10-Phenanthroline in 100 ml of water
color change = pale-blue to red
 
N-Phenylanthranilic acid:
Dissolve 0.1 g in 5 ml of 0.1M sodium hydroxide and make up to 100 ml with water.
color change = purple-red to colorless
 
Safranin
Dissolve 0.5g in 100 ml water
color change = blue-violet(acidic),brown (alkaline) to colorless
 
2.2':6.2"-Terpyridine (iron(II) complex)
Dissolve 0.232 g FeSO4 x 7H2O and 0.389 g of 2.2':6.2-terpyridine in 100 ml of water
color change = pale-blue to red
 
Thionine
Dissolve 0.5g in 100 ml of 95% ethanol
color change = violet to colorless
 
Variamine blue salt B
Dissolve 1.0 g in 100 ml of water or grind with sodium chloride or sodium sulfate anhydrous trituration
color change = blue-violet(acidic),yellow (alkaline) to colorless
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